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A parallactic second is used to measure the apparent shift of a star as seen from opposite sides of Earth's orbit around the sun. This movement, caused by the angle at which we view stars, can then be converted into distance. And so, it is considered as a unit of distance in astronomy. 1 parsec is eRead more
A parallactic second is used to measure the apparent shift of a star as seen from opposite sides of Earth‘s orbit around the sun. This movement, caused by the angle at which we view stars, can then be converted into distance. And so, it is considered as a unit of distance in astronomy. 1 parsec is equal to 3.26 light-years.
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Fermi was a physicist who came up with the concept of the fermi unit. The word "fermi" is used in physical science and chemistry to measure extremely small amounts of something. In physics, for example, one fermi could be defined as the amount of space an electron would take up if it were travelingRead more
Fermi was a physicist who came up with the concept of the fermi unit. The word “fermi“ is used in physical science and chemistry to measure extremely small amounts of something.
In physics, for example, one fermi could be defined as the amount of space an electron would take up if it were traveling at the speed of light, which is about 300 million meters per second. The fermi unit is one ten–millionth of a meter (1E–10 m).
In nuclear science, the fermi unit is used to measure how big an atomic nucleus is. The word “fermi“ can also be used in chemistry to refer to the amount of space that a hydrogen atom would take up if it were traveling at light speed, which means it would have about one–quarter of a millionth of a centimeter in diameter.
A “fermi–steradian“ is one ten millionth of the total amount of light energy that falls on an object from all directions (1E–10 sr).
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The refractive index of a medium for light is given by the relation n = c/v where v is the speed of light through a vacuum. For glass, it will be 1.5 and hence, the speed of light in glass will be minimum i.e., 200 000 km/s as compared to 400 000 km/s in a vacuum. So, it will take more time for lighRead more
The refractive index of a medium for light is given by the relation n = c/v where v is the speed of light through a vacuum. For glass, it will be 1.5 and hence, the speed of light in glass will be minimum i.e., 200 000 km/s as compared to 400 000 km/s in a vacuum. So, it will take more time for light to travel through glass.
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The irritation threshold is the amount of stimulation a person can experience before his stress levels rise and he experiences psychological discomfort. This concept has been studied in various settings, such as workplaces, schools, and households. In general, the higher a person's level of educatioRead more
The irritation threshold is the amount of stimulation a person can experience before his stress levels rise and he experiences psychological discomfort.
This concept has been studied in various settings, such as workplaces, schools, and households. In general, the higher a person‘s level of education or income, the lower their threshold for frustration becomes.
It can also be defined as the point at which a person notices something and becomes annoyed. It is not the same as a phobia, which is an irrational fear of something.
Rather, it is simply an annoyance that occurs when something happens too frequently or at a level that seems out of proportion to the situation.
It can also be used in terms of noise and other irritants. For instance, a person may be able to tolerate the sound of a neighbor’s television, but once it reaches a certain level, he may become annoyed and call the police.
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Explanation: Energy and Work Energy is the capacity to do work or to produce heat. Internal energy is the sum of kinetic energy and the potential energy.
Explanation:
Energy and Work Energy is the capacity to do work or to produce heat. Internal energy is the sum of kinetic energy and the potential energy.
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Explanation: The safest hammers are those with heads that are alloy and drop-forged steel. Made of one of the strongest copper alloys, aluminum bronze hammer heads are strong, spark-resistant heads commonly used in flammable environments where a steel hammer would be a safety hazard.
Explanation:
The safest hammers are those with heads that are alloy and drop-forged steel. Made of one of the strongest copper alloys, aluminum bronze hammer heads are strong, spark-resistant heads commonly used in flammable environments where a steel hammer would be a safety hazard.
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Explanation: Nuclear energy is energy stored in the nucleus of an atom—the energy that holds the nucleus together.
Explanation:
Nuclear energy is energy stored in the nucleus of an atom—the energy that holds the nucleus together.
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Explanation: The frequency of Gamma rays is the highest. Gamma rays are the highest energy EM radiation and typically have energies greater than 100 keV, frequencies greater than 1019 Hz, and wavelengths less than 10 picometers.
Explanation:
The frequency of Gamma rays is the highest. Gamma rays are the highest energy EM radiation and typically have energies greater than 100 keV, frequencies greater than 1019 Hz, and wavelengths less than 10 picometers.
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Answer: Current in a conductor can be increased by increasing the voltage across it and reducing its resistance.
Answer:
Current in a conductor can be increased by increasing the voltage across it and reducing its resistance.
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An air-blast circuit breaker is a device that automatically stops the flow of electricity in a circuit when it senses an overload. These devices are typically used for heavy duty equipment, such as large motors and electric welding machines, because they can stop power from flowing even if the mainRead more
An air-blast circuit breaker is a device that automatically stops the flow of electricity in a circuit when it senses an overload.
These devices are typically used for heavy duty equipment, such as large motors and electric welding machines, because they can stop power from flowing even if the main power source has been interrupted.
While air-blast circuit breakers are relatively easy to use, they should be installed only by people with the proper training.
Resistance switching is normally employed in air-blast circuit breakers. The device is positioned at the end of a circuit, and it interrupts current flow when it detects an overload condition.
When this happens, a piston within the air-blast circuit breaker moves to create a pressure differential between two chambers inside the unit. This causes compressed air to be released from one chamber through nozzles in the device.
The air then flows through a nozzle to create an explosion that pushes open one or more breakers within the air-blast circuit breaker, thereby shutting off electricity flow in the circuit.
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